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Because of a lack of impurities like bacteria and pesticides, distilled water is beneficial for individuals with weakened immune systems (e.g., people with HIV/AIDs or cancers)

Mutoh et al, 1990

Diet-derived and diet-related endogenously produced palmitic acid: effects on metabolic regulation and cardiovascular disease risk

A medication that looks normal in color could still be past its beyond-use date, contaminated with bacteria you cannot see, or degraded in potency without visible change
